I've got a 63 Futura convertible with 6cyl. Started to run a little ruff. Pulled plugs and cleaned altho all were in good shape. Did same with distributor and rotor. Have replaced condenser and coil. Will not start. Yes I have tried to pour gas directly into carb for start but still nada. Battery is strong and it cranks/turns fast and effortlessly. Any ideas on where I might look/try. Thx, Keith